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1) Rename SetDelegate to Bind in accordance with other handlers.
2) Remove unnecessary page_is_ready()/show_on_init_ logic: calls
to ShowScreen / JSCall are automatically deferred until JS side is
initialized.
3) Pass screen parameters as the part of the Show method.

Bug: 1084928
Change-Id: I9c33b8b7330a04db430ead770eae8c347c95a5cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2210440
Commit-Queue: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771000}